A rapid heartbeat can be caused by emotional stress, over-exercise, or certain diseases. 1. Emotional tension: when emotional tension, especially excited will appear the phenomenon of generalized weakness heartbeat acceleration, such as seeing a favorite person or by some kind of stimulation will appear the phenomenon of generalized weakness heartbeat acceleration. 2. Excessive exercise: Excessive exercise will cause the body to sweat a lot, resulting in the loss of water in the body, leading to dehydration, and at the same time increase the burden on the heart to cause chest tightness, panic, and the phenomenon of generalized weakness and rapid heartbeat. 3. Certain diseases: when there are certain diseases such as hyperthyroidism, anemia, myocardial ischemia, hypokalemia and other diseases, the phenomenon of generalized weakness and rapid heartbeat will occur. If the patient has the symptoms of generalized weakness and rapid heartbeat, it is recommended to consult the doctor in time, under the guidance of the doctor, to clarify the cause of the disease, and take corresponding treatment plan.